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‎.ghcid‎

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--command "wasm32-wasi-cabal repl --enable-multi-repl"
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--restart cabal.project
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--restart canary.cabal

‎.github/workflows/ci.yml‎

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name: ci
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on:
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merge_group:
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pull_request:
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push:
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branches:
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- master
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workflow_dispatch:
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jobs:
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ci:
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name: ci-${{ matrix.flavour }}
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runs-on: ubuntu-24.04
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continue-on-error: ${{ matrix.experimental }}
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strategy:
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fail-fast: false
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matrix:
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flavour:
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- "9.12"
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- "9.10"
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experimental:
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- false
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include:
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- flavour: "gmp"
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experimental: true
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steps:
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- name: checkout
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uses: actions/checkout@v4
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- name: ghc-wasm-meta
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run: |
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pushd "$(mktemp -d)"
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curl -f -L https://gitlab.haskell.org/haskell-wasm/ghc-wasm-meta/-/archive/master/ghc-wasm-meta-master.tar.gz | tar xz --strip-components=1
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PLAYWRIGHT=1 ./setup.sh
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~/.ghc-wasm/add_to_github_path.sh
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cp cabal.project.local ${{ github.workspace }}
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popd
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env:
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FLAVOUR: ${{ matrix.flavour }}
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- name: gen-plan-json
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run: |
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wasm32-wasi-cabal build --dry-run
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- name: cabal-cache
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uses: actions/cache@v4
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with:
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key: ${{ matrix.flavour }}-${{ hashFiles('dist-newstyle/cache/plan.json') }}
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restore-keys: ${{ matrix.flavour }}-
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path: |
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~/.ghc-wasm/.cabal/store
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dist-newstyle
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- name: ci
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run: |
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./util/ci

‎.gitignore‎

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cabal.project.local
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ci.log
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dist-newstyle

‎CHANGELOG.md‎

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# Revision history for canary
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## 0.1.0.0 -- YYYY-mm-dd
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* First version. Released on an unsuspecting world.

‎LICENSE‎

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Copyright (c) 2025, Cheng Shao
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

‎cabal.project‎

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packages: .
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tests: True
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source-repository-package
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type: git
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location: https://github.com/amesgen/splitmix.git
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tag: cea9e31bdd849eb0c17611bb99e33d590e126164
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package *
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optimization: 2
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ghc-options: -fdicts-cheap -fexpose-all-unfoldings -flate-dmd-anal -flate-specialise -fspecialise-aggressively
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package tasty
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flags: -unix
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package vector
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flags: -boundschecks

‎canary.cabal‎

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cabal-version: 3.14
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name: canary
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version: 0.1.0.0
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license: BSD-3-Clause
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license-file: LICENSE
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author: Cheng Shao
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maintainer: [email protected]
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build-type: Simple
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extra-doc-files: CHANGELOG.md
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common deps
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build-depends:
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aeson >=2.2.3.0,
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base,
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ghc-experimental,
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text,
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vector >=0.13.2.0,
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vector-stream >=0.1.0.1,
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default-language: GHC2024
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ghc-options:
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-Weverything
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-Wno-all-missed-specialisations
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-Wno-implicit-prelude
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-Wno-missing-export-lists
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-Wno-missing-import-lists
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-Wno-missing-kind-signatures
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-Wno-missing-local-signatures
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-Wno-missing-poly-kind-signatures
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-Wno-missing-role-annotations
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-Wno-missing-safe-haskell-mode
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-Wno-prepositive-qualified-module
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-Wno-unsafe
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library
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import: deps
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exposed-modules:
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Data.Stream.Monadic.Extra
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Data.Text.Extra
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GHC.Wasm.JS.Array
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GHC.Wasm.JS.AsyncIterator
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GHC.Wasm.JS.ESM
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GHC.Wasm.JS.Free
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GHC.Wasm.JS.JSON
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GHC.Wasm.JS.Promise
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GHC.Wasm.JS.ReadableStream
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GHC.Wasm.JS.RuntimeFFI
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GHC.Wasm.JS.String
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GHC.Wasm.JS.Uint8Array
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hs-source-dirs: src
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build-depends:
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bytestring,
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primitive >=0.9.1.0,
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test-suite canary-test
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import: deps
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type: exitcode-stdio-1.0
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hs-source-dirs: test
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main-is: Main.hs
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build-depends:
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async >=2.2.5,
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canary,
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quickcheck-instances >=0.3.32,
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tasty >=1.5.3,
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tasty-hunit >=0.10.2,
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tasty-quickcheck >=0.11.1,

‎src/Data/Stream/Monadic/Extra.hs‎

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module Data.Stream.Monadic.Extra
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( toLazyList,
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toVector,
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)
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where
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import Control.Monad
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import Control.Monad.Primitive
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import Data.Stream.Monadic qualified as VS
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import Data.Vector.Fusion.Bundle.Monadic qualified as VB
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import Data.Vector.Fusion.Bundle.Size qualified as VB
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import Data.Vector.Generic qualified as V
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import Data.Vector.Generic.Mutable qualified as MV
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toLazyList :: (PrimBase m) => VS.Stream m a -> m [a]
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toLazyList (VS.Stream step s) = w s
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where
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w s0 = unsafeInterleave $ do
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r <- step s0
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case r of
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VS.Yield x s1 -> do
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xs <- w s1
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pure $ x : xs
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VS.Skip s1 -> w s1
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VS.Done -> pure []
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toVector :: (PrimMonad m, V.Vector v a) => VS.Stream m a -> m (v a)
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toVector = V.unsafeFreeze <=< MV.munstream . flip VB.fromStream VB.Unknown

‎src/Data/Text/Extra.hs‎

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{-# LANGUAGE MultiWayIf #-}
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module Data.Text.Extra
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( unsafeCreate,
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unsafeCreateUpToN,
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unsafeUse,
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)
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where
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import Data.Functor
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import Data.Primitive
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import Data.Text.Internal qualified as T
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import Foreign
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import System.IO.Unsafe
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unsafeCreate :: Int -> (Ptr Word8 -> IO ()) -> T.Text
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unsafeCreate len k = unsafeCreateUpToN len $ \ptr -> k ptr $> len
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unsafeCreateUpToN :: Int -> (Ptr Word8 -> IO Int) -> T.Text
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unsafeCreateUpToN max_len k
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| max_len <= 0 = T.empty
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| otherwise = unsafePerformIO $ do
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mba <- newPinnedByteArray max_len
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len <- k (mutableByteArrayContents mba)
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ba <- unsafeFreezeByteArray mba
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pure $ T.Text ba 0 len
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unsafeUse :: T.Text -> (Ptr Word8 -> Int -> IO a) -> a
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unsafeUse (T.Text ba off len) k =
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unsafePerformIO $
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if
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| len <= 0 -> k nullPtr 0
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| isByteArrayPinned ba -> withByteArrayContents ba $
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\ptr -> k (ptr `plusPtr` off) len
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| otherwise -> do
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mba <- newPinnedByteArray len
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withMutableByteArrayContents mba $ \ptr -> do
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copyByteArray mba 0 ba off len
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k ptr len
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‎src/GHC/Wasm/JS/Array.hs‎

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module GHC.Wasm.JS.Array (
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JSArray (..),
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fromJSVals,
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toJSVals,
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) where
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import qualified Data.Vector.Generic as V
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import GHC.Wasm.Prim
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import System.IO.Unsafe
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newtype JSArray = JSArray { unJSArray :: JSVal }
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fromJSVals :: (V.Vector v JSVal) => v JSVal -> JSArray
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fromJSVals vs = unsafePerformIO $ do
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arr <- arrayNew
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V.forM_ vs $ arrayPush arr
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pure arr
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toJSVals :: (V.Vector v JSVal) => JSArray -> v JSVal
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toJSVals arr = V.generate (arrayLength arr) (arrayIndex arr)
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foreign import javascript unsafe
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"[]"
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arrayNew :: IO JSArray
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foreign import javascript unsafe
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"$1.push($2)"
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arrayPush :: JSArray -> JSVal -> IO ()
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foreign import javascript unsafe
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"$1.length"
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arrayLength :: JSArray -> Int
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foreign import javascript unsafe
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"$1[$2]"
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arrayIndex :: JSArray -> Int -> JSVal

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